MINIATURE HALOGEN LAMPS

Transcription

1 MINIATURE HALOGEN LAMPS REFLECTORIZED LAMP TYPES PARABOLIC & ELLIPTICAL The following technical specification tables are for the standard reflectorized lamp products offered by Welch Allyn. Our precision fabrication of lamps and optical components will ensure the desired results for your critical applications. We invite you to contact our experienced application engineers if a standard product does not fit your requirements. Optical system performance often depends on much more than the lamp itself. The right reflector can increase the optical system efficiency by 300% to 500%. With more than 30 years of miniature optical system experience, Welch Allyn offers a full line of metal and glass reflectors to complement its precision lamps. MR-3 to MR-11 sizes: 9.5mm (0.375 inches) to 35.1mm (1.38 inches) Precise lamp alignment within the reflector for optimum performance Complete advanced testing for output and spot size based on your requirements Single and multiple surface designs Welch Allyn s subminiature reflectorized lamp assemblies are specifically designed for applications where optical system performance is critical. Welch Allyn reflectorized lamps are used in various products in the following markets: Flashlights/Torches Chemical and Clinical Analysis Medical and Dental Instrumentation Fiber Optic Illumination Machine Vision Microscope Illumination Industrial Safety Headlamps Our design and application engineers can assist you in selecting the appropriate lamp and reflector for your specifications. We invite you to contact us for your custom design requests. Lighting Products Division 4619 Jordan Road Skaneateles Falls, NY Phone: Fax:

2 Elliptical Specifications Lamp Number 3.00 Volts Amps Color Temp K Life Hours Reflector Size F2 Spot Size Using Aperture Diame ter Of (mm) 1.27 mm 2.5 mm Focal Distance (mm) Lamp Type G=Gas H=Halogen MR G MR G 3.50 Volts MR G MR G MR G MR G MR G 3.65 Volts MR H 4.25 Volts MR H MR H 5.00 Volts ,000 MR G ,000 MR G ,000 MR G ,000 MR H 6.00 Volts MR H 6.27 Volts MR H MR H MR H Volts MR H MR H MR H Volts MR H Dimensions are in millimeters. 1 inch = 25.4mm Output is in Lux: Footcandles = Lux Table of Numerical Apertures for Elliptical Reflectors MR 3.35 MR 4.40 MR 6.42 MR 8.39 MR11.38 Numerical Aperture (NA): The measure of the sine of the half angle of the light rays that will be accepted by a fiber optic bundle. The NA of the lamp should be less than or equal to the NA of the fiber optic bundle.

3 Elliptical Terms and Characteristics Explained Elliptical reflectorized lamps deliver high intensity light efficiently into small apertures or fiber optic bundles. Spot Size 100% Intensity 50% Spot Diameter For elliptical reflectors spot size is the diameter determined by the edge of the spot having 50% of the center peak intensity. Focal Distance Focal Distance F2 Focal Distance in elliptical reflectors is measured from the rim of the reflector to the F2 spot location. F2: The secondary focal point of an ellipse.

4 Spot Size for Lamps with Large Filaments 100% Intensity 50% Spot Diameter In elliptical reflectorized lamps with large filaments (8211-XXX), large spots are produced. In these cases the projected spot is not a point peak. When focused correctly the spot produced is an oblong shape with two peaks of highest intensity at each end. Lamps with large filaments may have spots that are more oval in shape. In these cases the measured spot diameter is always the narrower diameter. The projected spot from some elliptical reflectors may visually appear to be somewhat off center with the axis of the reflector. However, they are assembled to provide the specified Lux through an aperture on axis at the F2 location. This does not imply the specified Lux would be accepted into a fiber optic system due to NA consideration.

5 Parabolic Specifications Lamp 3.00 Volts Amps Color Temp K Life Hours Reflector Size Divergence Angle ± 2 o Minimum Required Distan ce From Reflector Rim To Target (mm) Lux Measured From A Dist ance Of 0.9m 1.22m Lamp Type G=Gas H=Halogen MR G MR G 4.25 Volts MR H MR H 5.00 Volts ,000 MR G ,000 MR G ,000 MR Volts MR H Volts MR H MR H MR H MR H MR H Volts MR H Dimensions ar e in millime ters. 1 inch = 25.4mm Output is in Lux: Footcandles = Lux NOTES Life is the average number of hours until a lamp reaches end of life which is signified by burn out. Halogen lamps must be run with minimum heat sinking for optimum halogen cycle. Sockets are available to facilitate operation of the reflectorized lamps. For more information contact our applications engineers. Although halogen lamps should be run with minimum heat sinking for optimum halogen cycle, heat sinking is required so that the reflector neck temperatures of 105 are not exceeded in lamps using plastic sockets.

6 Parabolic Terms and Characteristics Explained Elliptical reflectorized lamps deliver high intensity light efficiently into small apertures or fiber optic bundles. 50% of Peak Intensity Peak Intensity Divergence Angle = a d Parabolic reflectorized lamps are designed with various beam divergence angles which are measured at the 50% intensity points. Minimum Distance Required from Reflector Rim to Target: Because the reflectors are true parabolic shapes, the hole in the back of the reflector is imaged at the center of the projected spot at distances less than the specified distance required between the reflector rim and the target. Spot Diameter = 2 x (d x tan(a/2)) as defined in the diagram.

7 MR Reflector Dimensions in Millimeters (Inches) Our MR reflectors are aluminum and come with a metallic coating each unit of MR is equal to 3.175mm (.125 inches) MR3 = 3 (3.175mm). F2 Applies to Elliptical Reflectors ONLY Glass MR-11 Reflectors with dichroic coating are available upon request. Consult factory at Welch Allyn LPD. LSL 305 Rev A Printed in USA 10/99 WelchAllyn Your source for precision arc and halogen lamps